The line comes from Dragon Ball Z, when Vegeta's scouter measures Goku's power level during the Saiyan saga and the villain screams the reading before crushing the device. The English dub's 'over nine thousand' phrasing turned the moment into one of the internet's earliest anime memes, spreading through YouTube remix videos and image macros around 2006 and 2007. Two decades later it remains shorthand for any number too large to believe, quoted by fans far beyond anime circles.